March 20, Deems Padgett TRC Solutions 55 2 nd Street, Suite 575 San Francisco, CA 94105

Transcription

1 March 20, 2008 Deems Padgett TRC Solutions 55 2 nd Street, Suite 575 San Francisco, CA RE: Summary of Monitoring Results Hunters Point Power Plant Decommissioning 1000 Evans Avenue San Francisco, California Dear Mr. Padgett: RGA Environmental, Inc. (RGA) was requested to perform air monitoring at perimeter fence line locations during active abatement and demolition work at the captioned facility. Four (4) air monitoring stations have been established on the property. The locations, testing equipment, analytical methods, and air monitoring goals 1 are discussed in the Monitoring Procedures. Attached are the following tables and graphs: Table I Phase Contrast Microscopy (PCM) air sampling for airborne fibers. Graphic representation of PCM data for air monitoring stations (AMS) 1-4. Table II Metals air sampling for airborne lead, nickel, and total chromium. Graphic representation of metals data for AMS 1-4. Table IIIC Particulates air sampling for airborne dust particles total and respirable dust methods. Graphic representation of total and respirable dust data for AMS 1-4. This summary report includes air monitoring data from February 1, 2008 through February 29, None of the respirable dust, total dust, airborne fibers by PCM, chromium, lead, or nickel results exceeded the footnoted air monitoring goals during the referenced monitoring period. Twenty (20) days of air monitoring is included in this reporting period. No site work or air monitoring was performed on February 18, 2008 during observation of the Presidents Day holiday. Total dust air samples collected on February 19, 2008 were lost following receipt at the analytical laboratory. PCM, chromium, lead, nickel and total dust air samples collected on February 22, 2008 were lost during shipment to the analytical laboratory. RGA utilizes a third-party shipper to transport samples to the analytical laboratory. In an effort to provide more timely information regarding loss shipments, RGA will actively track daily shipments and provide a preliminary notice to TRC should our shipments not arrive at its intended destination as scheduled. 1 Air Monitoring Goals: Airborne fibers (asbestos): less than 0.01 fiber per cubic centimeter (f/cc) Total inorganic chromium as a particulate: milligrams per cubic meter (mg/m 3 ) Total inorganic lead as a particulate: mg/m 3 Total inorganic nickel as a particulate: mg/m 3 Particulates less than 10 µm: 0.05 mg/m 3 (retired air monitoring method) Total particulates (dust): 1.0 mg/m 3 Respirable particulates (dust): 0.5 mg/m 3

2 In addition, if a pattern of loss is suspected, RGA will make changes to our shipping drop locations and/or our shipping vendor. RGA will obtain an explanatory review document from our analytical laboratory regarding the total dust samples collected on February 19 th that were received but lost. Should RGA determine there is a pattern that creates risks for samples losses, RGA will consider a change to an alternative analytical laboratory. Copies of the laboratory reports, chain-of-custody forms, and hourly trend graphs (real-time dust monitors) are available for review in the field office. Respectfully, RGA Environmental, Inc. Kenneth Pilgrim Project Manager Attachments: Table I, Table II, Table IIIC, Airborne Fibers by PCM (AMS 1-4), Chromium, Lead, and Nickel (AMS 1-4), Total Dust (AMS 1-4), Respirable Dust by Real-time Instrumentation (AMS 1-4)

3 Collection Date AMS RGA Sample # Start: End: Duration Results (Min) f/cc Table I Monitoring - PCM PGE Hunters Point Power Plant Decommissioning Wind Conditions Comments 2/1/ P2 7:20 14: < Wind 3-4 West Northwest 2/1/ P3 7:25 14: < Wind 3-4 West Northwest 2/1/ P4 7:30 14: < Wind 3-4 West Northwest 2/4/ P2 7:00 14: Wind 4-5 Northwest 2/4/ P3 6:55 14: < Wind 4-5 Northwest 2/4/ P4 6:50 14: < Wind 4-5 Northwest P1 7:20 14: < Wind 1 Northwest P3 7:25 14: Wind 1 Northwest P4 7:30 14: < Wind 1 Northwest P2 7:10 14: < Wind 5-15 West P3 7:05 14: < Wind 5-15 West P4 7:00 14: Wind 5-15 West P2 7:35 14: Wind 4-19 Northeast P3 7:30 14: < Wind 4-19 Northeast P4 7:25 14: < Wind 4-19 Northeast P1 7:00 14: < Wind 1-11 Northwest P3 7:05 14: < Wind 1-11 Northwest P4 7:10 14: Wind 1-11 Northwest P2 7:00 14: Wind 1-15 Southeast P3 7:05 14: Wind 1-15 Southeast P4 7:10 14: Wind 1-15 Southeast P1 7:00 14: Wind 2-22 Northwest P3 7:05 14: Wind 2-22 Northwest P4 7:10 14: Wind 2-22 Northwest Report Date: Thursday, March 13, 2008 Page 1 of 3 Report Notes: 1) See Chain-of-Custody for sample flow rate, total volume. 2) Laboratory analysis performed by RJ Lee Group, Inc. in San Leandro, CA 3) Samples collected on 25 mm, 0.8um mixed celloluse ester casettes 4) Samples analyzed in accordance with the National Institute for Occupatoinal Safety and Health Method ) < = Results less than analytical reporting limit for the sample Abbreviations: f/cc = fibers per cubic centimeter, Min. = Minutes, AMS = Air Monitoring Station RGA Environmental, Inc.

4 Collection Date AMS RGA Sample # Start: End: Duration Results (Min) f/cc Wind Conditions Comments P2 7:00 14: < Wind 1-18 Northwest P3 6:55 14: < Wind 1-18 Northwest P4 6:50 14: < Wind 1-18 Northwest P1 7:00 14: Wind 5-25 North P3 7:05 14: Wind 5-25 North P4 7:10 14: Wind 5-25 North P2 6:50 14: < Wind 2-15 Northwest P3 6:55 14: < Wind 2-15 Northwest P4 7:00 14: Wind 2-15 Northwest Holiday no active work Holiday no active work Holiday no active work P2 7:30 14: Wind 1-13 Northwest P3 7:25 14: < Wind 1-13 Northwest P4 7:20 14: < Wind 1-13 Northwest P1 7:10 14: < Wind 1-10 Southwest P3 7:05 14: < Wind 1-10 Southwest P4 7:00 14: Wind 1-10 Southwest P1 6:45 14: < Wind 1-12 Southwest P3 6:40 14: < Wind 1-12 Southwest P4 6:35 14: Wind 1-12 Southwest samples lost in shipment samples lost in shipment samples lost in shipment P1 7:05 14: Wind 2-4 West P3 7:00 14: Wind 2-4 West P4 6:55 14: Wind 2-4 West Report Date: Thursday, March 13, 2008 Page 2 of 3 Report Notes: 1) See Chain-of-Custody for sample flow rate, total volume. 2) Laboratory analysis performed by RJ Lee Group, Inc. in San Leandro, CA 3) Samples collected on 25 mm, 0.8um mixed celloluse ester casettes 4) Samples analyzed in accordance with the National Institute for Occupatoinal Safety and Health Method ) < = Results less than analytical reporting limit for the sample Abbreviations: f/cc = fibers per cubic centimeter, Min. = Minutes, AMS = Air Monitoring Station RGA Environmental, Inc.

5 Collection Date AMS RGA Sample # Start: End: Duration Results (Min) f/cc Wind Conditions Comments P2 6:45 14: Wind 3-4 North P3 6:40 14: Wind 3-4 North P4 6:35 14: Wind 3-4 North P1 7:00 14: Wind 4-5 West P3 6:55 14: Wind 4-5 West P4 6:50 14: Wind 4-5 West P2 7:10 14: Wind 3-5 West P3 7:05 14: < Wind 3-5 West P4 7:00 14: Wind 3-5 West 2/29/ P1 6:40 14: Wind 5-7 West 2/29/ P3 6:35 14: < Wind 5-7 West 2/29/ P4 6:30 14: Wind 5-7 West Report Date: Thursday, March 13, 2008 Page 3 of 3 Report Notes: 1) See Chain-of-Custody for sample flow rate, total volume. 2) Laboratory analysis performed by RJ Lee Group, Inc. in San Leandro, CA 3) Samples collected on 25 mm, 0.8um mixed celloluse ester casettes 4) Samples analyzed in accordance with the National Institute for Occupatoinal Safety and Health Method ) < = Results less than analytical reporting limit for the sample Abbreviations: f/cc = fibers per cubic centimeter, Min. = Minutes, AMS = Air Monitoring Station RGA Environmental, Inc.

6 Table II Monitoring - Metals PGE Hunters Point Power Plant Decommissioning Collection Date AMS RGA Sample # Start: End: Duration Chromium (Min) (mg/m3) Lead (mg/m3) Nickel (mg/m3) Wind Conditions: Comments 2/1/ P2 7:20 14: < < < Wind 3-4 West Northwest 2/1/ P3 7:25 14: < < < Wind 3-4 West Northwest 2/1/ P4 7:30 14: < < < Wind 3-4 West Northwest 2/4/ P2 7:00 14: < < < Wind 4-5 Northwest 2/4/ P3 6:55 14: < < < Wind 4-5 Northwest 2/4/ P4 6:50 14: < < < Wind 4-5 Northwest P1 7:20 14: < < < Wind 1 Northwest P3 7:25 14: < < < Wind 1 Northwest P4 7:30 14: < < < Wind 1 Northwest P2 7:10 14: < < < Wind 5-15 West P3 7:05 14: < < < Wind 5-15 West P4 7:00 14: < < < Wind 5-15 West P2 7:35 14: < < < Wind 4-19 Northeast P3 7:30 14: < < < Wind 4-19 Northeast P4 7:25 14: < < < Wind 4-19 Northeast P1 7:00 14: < < < Wind 1-11 Northwest P3 7:05 14: < < < Wind 1-11 Northwest P4 7:10 14: < < < Wind 1-11 Northwest P2 7:00 14: < < Wind 1-15 Southeast P3 7:05 14: < < < Wind 1-15 Southeast P4 7:10 14: < < < Wind 1-15 Southeast P1 7:00 14: < < < Wind 2-22 Northwest P3 7:05 14: < < Wind 2-22 Northwest P4 7:10 14: < < < Wind 2-22 Northwest P2 7:00 14: < < < Wind 1-18 Northwest P3 6:55 14: < < Wind 1-18 Northwest P4 6:50 14: < < Wind 1-18 Northwest P1 7:00 14: < < < Wind 5-25 North P3 7:05 14: < < Wind 5-25 North P4 7:10 14: < < Wind 5-25 North Report Date: Thursday, March 13, 2008 Page 1 of 2 Report Notes: 1) See Chain-of-Custody for sample flow rate, total volume 2) Laboratory analysis performed by RJ Lee Group, Inc. in Monroeville, PA 3) Samples collected on 37 mm, 0.8um mixed celloluse ester casettes 4) Samples analyzed in accordance with the National Institute for Occupatoinal Safety and Health Method 7300/7300-PA 5) < = Results less than analytical reporting limit for the sample Abbreviations: mg/m3 = milligrams per cubic meter, Min. = Minutes, AMS = Air Monitoring Station RGA Environmental, Inc.

7 Collection Date AMS RGA Sample # Start: End: Duration Chromium (Min) (mg/m3) Lead (mg/m3) Nickel (mg/m3) Wind Conditions: Comments P2 6:50 14: < < < Wind 2-15 Northwest P3 6:55 14: < < < Wind 2-15 Northwest P4 7:00 14: < < Wind 2-15 Northwest Holiday no active work Holiday no active work Holiday no active work P2 7:30 14: < < Wind 1-13 Northwest P3 7:25 14: < < Wind 1-13 Northwest P4 7:20 14: < < < Wind 1-13 Northwest P1 7:10 14: < < Wind 1-10 Southwest P3 7:05 14: < < < Wind 1-10 Southwest P4 7:00 14: < < < Wind 1-10 Southwest P1 6:45 14: < < Wind 1-12 Southwest P3 6:40 14: < < Wind 1-12 Southwest P4 6:35 14: < < < Wind 1-12 Southwest samples lost in shipment samples lost in shipment samples lost in shipment P1 7:05 14: < < Wind 2-4 West P3 7:00 14: < < < Wind 2-4 West P4 6:55 14: < < < Wind 2-4 West P2 6:45 14: < < Wind 3-4 North P3 6:40 14: < < < Wind 3-4 North P4 6:35 14: < < < Wind 3-4 North P1 7:00 14: < < < Wind 4-5 West P3 6:55 14: < < Wind 4-5 West P4 6:50 14: < < Wind 4-5 West P2 7:10 14: < < Wind 3-5 West P3 7:05 14: < < Wind 3-5 West P4 7:00 14: < < Wind 3-5 West 2/29/ P1 6:40 14: < < Wind 5-7 West 2/29/ P3 6:35 14: < < Wind 5-7 West 2/29/ P4 6:30 14: < < Wind 5-7 West Report Date: Thursday, March 13, 2008 Page 2 of 2 Report Notes: 1) See Chain-of-Custody for sample flow rate, total volume 2) Laboratory analysis performed by RJ Lee Group, Inc. in Monroeville, PA 3) Samples collected on 37 mm, 0.8um mixed celloluse ester casettes 4) Samples analyzed in accordance with the National Institute for Occupatoinal Safety and Health Method 7300/7300-PA 5) < = Results less than analytical reporting limit for the sample Abbreviations: mg/m3 = milligrams per cubic meter, Min. = Minutes, AMS = Air Monitoring Station RGA Environmental, Inc.

8 Collection Date AMS RGA Sample # Table III C Monitoring - Total and Respirable Particulates PGE Hunters Point Power Plant Decommissioning Gravimetric Dust Aerosol - Total Sample Start Sample End Duration (Min) Results mg/m3 Sample Start Sample End Real - Time Dust Aerosol - Respirable Duration: (Min) Min mg/m3: Max mg/m3: TWA mg/m3 Wind Conditions Comments 2/1/ P2 7:20 14: :30 14: Wind 3-4 West Northwest 2/1/ P3 7:25 14: < :40 14: Wind 3-4 West Northwest 2/1/ P4 7:30 14: :34 14: Wind 3-4 West Northwest 2/4/ P2 7:00 14: :04 14: Wind 4-5 Northwest 2/4/ P3 6:55 14: :08 14: Wind 4-5 Northwest 2/4/ P4 6:50 14: < :55 14: Wind 4-5 Northwest P1 7:20 14: < :34 14: Wind 1 Northwest P3 7:25 14: < :44 14: Wind 1 Northwest P4 7:30 14: < :37 14: Wind 1 Northwest P2 7:10 14: :14 14: Wind 5-15 West P3 7:05 14: :17 14: Wind 5-15 West P4 7:00 14: :04 14: Wind 5-15 West P2 7:35 14: :40 14: Wind 4-19 Northeast P3 7:30 14: :45 14: Wind 4-19 Northeast P4 7:25 14: :30 14: Wind 4-19 Northeast P1 7:00 14: < :13 14: Wind 1-11 Northwest P3 7:05 14: < :24 14: Wind 1-11 Northwest P4 7:10 14: < :20 14: Wind 1-11 Northwest Report Date: Friday, March 14, 2008 Page 1 of 4 Report Notes: 1) See Chain-of-Custody for sample flow rate, total volume 2) Laboratory analysis performed by RJ Lee Group, Inc. in Monroeville, PA 3) Samples collected on 37 mm, 5um poly vinyl chloride (PVC) cassette 4) Samples analyzed in accordance with the National Institute for Occupatoinal Safety and Health Method ) < = Results less than analytical reporting limit for the sample Abbreviations: mg/m3 = milligrams per cubic meter, Min. = Minutes, AMS = Air Monitoring Station RGA Environmental, Inc.

9 Collection Date AMS RGA Sample # Gravimetric Dust Aerosol - Total Sample Start Sample End Duration (Min) Results mg/m3 Sample Start Sample End Real - Time Dust Aerosol - Respirable Duration: (Min) Min mg/m3: Max mg/m3: TWA mg/m3 Wind Conditions Comments P2 7:00 14: :20 14: Wind 1-15 Southeast P3 7:05 14: :32 14: Wind 1-15 Southeast P4 7:10 14: :22 14: Wind 1-15 Southeast P1 7:00 14: :10 14: Wind 2-22 Northwest P2 7:05 14: :22 14: Wind 2-22 Northwest P4 7:10 14: :14 14: Wind 2-22 Northwest P2 7:00 14: :03 14: Wind 1-18 Northwest P3 6:55 14: :07 14: Wind 1-18 Northwest P4 6:50 14: :52 14: Wind 1-18 Northwest P1 7:00 14: < :19 14: Wind 5-25 North P3 7:05 14: :31 14: Wind 5-25 North P4 7:10 14: < :22 14: Wind 5-25 North P2 6:50 14: :57 14: Wind 2-15 Northwest P3 6:55 14: :09 14: Wind 2-15 Northwest P4 7:00 14: :00 14: Wind 2-15 Northwest Holiday no active work Holiday no active work Holiday no active work Report Date: Friday, March 14, 2008 Page 2 of 4 Report Notes: 1) See Chain-of-Custody for sample flow rate, total volume 2) Laboratory analysis performed by RJ Lee Group, Inc. in Monroeville, PA 3) Samples collected on 37 mm, 5um poly vinyl chloride (PVC) cassette 4) Samples analyzed in accordance with the National Institute for Occupatoinal Safety and Health Method ) < = Results less than analytical reporting limit for the sample Abbreviations: mg/m3 = milligrams per cubic meter, Min. = Minutes, AMS = Air Monitoring Station RGA Environmental, Inc.

10 Collection Date AMS RGA Sample # Gravimetric Dust Aerosol - Total Sample Start Sample End Duration (Min) Results mg/m3 Sample Start Sample End Real - Time Dust Aerosol - Respirable Duration: (Min) Min mg/m3: Max mg/m3: TWA mg/m3 Wind Conditions Comments 1 7:33 14: Wind 1-13 Northwest samples lost in shipment 3 7:39 14: Wind 1-13 Northwest samples lost in shipment 4 7:24 14: Wind 1-13 Northwest samples lost in shipment P1 7:10 14: < :12 14: Wind 1-10 Southwest P3 7:05 14: < :17 14: Wind 1-10 Southwest P4 7:00 14: < :02 14: Wind 1-10 Southwest P1 6:45 14: < :51 14: Wind 1-12 Southwest P3 6:40 14: < :56 14: Wind 1-12 Southwest P4 6:35 14: < :41 14: Wind 1-12 Southwest 1 6:59 14: Wind 1-14 Southeast samples lost in shipment 3 7:04 14: Wind 1-14 Southeast samples lost in shipment 4 6:48 14: Wind 1-14 Southeast samples lost in shipment P1 7:05 14: :10 14: Wind 2-4 West P3 7:00 14: :13 14: Wind 2-4 West P4 6:55 14: :58 14: Wind 2-4 West P2 6:45 14: :51 14: Wind 3-4 North P3 6:40 14: :58 14: Wind 3-4 North P4 6:35 14: :42 14: Wind 3-4 North Report Date: Friday, March 14, 2008 Page 3 of 4 Report Notes: 1) See Chain-of-Custody for sample flow rate, total volume 2) Laboratory analysis performed by RJ Lee Group, Inc. in Monroeville, PA 3) Samples collected on 37 mm, 5um poly vinyl chloride (PVC) cassette 4) Samples analyzed in accordance with the National Institute for Occupatoinal Safety and Health Method ) < = Results less than analytical reporting limit for the sample Abbreviations: mg/m3 = milligrams per cubic meter, Min. = Minutes, AMS = Air Monitoring Station RGA Environmental, Inc.

11 Collection Date AMS RGA Sample # Gravimetric Dust Aerosol - Total Sample Start Sample End Duration (Min) Results mg/m3 Sample Start Sample End Real - Time Dust Aerosol - Respirable Duration: (Min) Min mg/m3: Max mg/m3: TWA mg/m3 Wind Conditions Comments P1 7:00 14: :07 14: Wind 4-5 West P3 6:55 14: :12 14: Wind 4-5 West P4 6:50 14: :57 14: Wind 4-5 West P2 7:10 14: :14 14: Wind 3-5 West P3 7:05 14: :20 14: Wind 3-5 West P4 7:00 14: :04 14: Wind 3-5 West 2/29/ P1 6:40 14: :47 14: Wind 5-7 West 2/29/ P3 6:35 14: < :54 14: Wind 5-7 West 2/29/ P4 6:30 14: :38 14: Wind 5-7 West Report Date: Friday, March 14, 2008 Page 4 of 4 Report Notes: 1) See Chain-of-Custody for sample flow rate, total volume 2) Laboratory analysis performed by RJ Lee Group, Inc. in Monroeville, PA 3) Samples collected on 37 mm, 5um poly vinyl chloride (PVC) cassette 4) Samples analyzed in accordance with the National Institute for Occupatoinal Safety and Health Method ) < = Results less than analytical reporting limit for the sample Abbreviations: mg/m3 = milligrams per cubic meter, Min. = Minutes, AMS = Air Monitoring Station RGA Environmental, Inc.

12 Airborne Fibers Analyzed by Phase Contrast Microscopy Air Monitoring Station 1 Fibers/cubic centimeter (F/cc) 2/29/2008 AMS 1 Permissible Exposure Limit f/cc

13 Airborne Fibers Analyzed by Phase Contrast Microscopy Air Monitoring Station 2 2/1/08 2/2/08 2/3/08 Fibers/cubic centimeter 2/4/08 2/5/08 2/6/08 2/7/08 2/8/08 2/9/08 2/10/08 2/11/08 2/12/08 2/13/08 2/14/08 2/15/08 2/16/08 2/17/08 2/18/08 2/19/08 2/20/08 2/21/08 2/22/08 2/23/08 2/24/08 2/25/08 2/26/08 2/27/08 2/28/08 AMS 2 Permissible Exposure Limit f/cc

14 Airborne Fibers Analyzed by Phase Contrast Microscopy Air Monitoring Station 3 2/1/08 2/2/08 2/3/08 Fibers/cubic centimeter (F/cc) 2/4/08 2/5/08 2/6/08 2/7/08 2/8/08 2/9/08 2/10/08 2/11/08 2/12/08 2/13/08 2/14/08 2/15/08 2/16/08 2/17/08 2/18/08 2/19/08 2/20/08 2/21/08 2/22/08 2/23/08 2/24/08 2/25/08 2/26/08 2/27/08 2/28/08 2/29/08 AMS 3 Permissible Exposure Limit f/cc

15 Airborne Fibers Analyzed by Phase Contrast Microscopy Air Monitoring Station 4 2/1/2008 2/2/2008 Fibers/cubic centimeter (F/cc) 2/3/2008 2/4/2008 2/29/2008 AMS 4 Permissible Exposure Limit f/cc

16 Chromium (total) Air Monitoring Station 1 2/29/2008 Permissible Exposure Limit mg/m mg/m3 AMS 1

17 Chromium (total) Air Monitoring Station 2 2/1/2008 2/2/2008 2/3/2008 2/4/2008 Permissible Exposure Limit mg/m mg/m3 AMS 2

18 Chromium (total) Air Monitoring Station 3 2/1/2008 2/2/2008 2/3/2008 2/4/2008 2/29/2008 Permissible Exposure Limit mg/m mg/m3 Monitoring Data AMS 3

19 Chromium (total) Air Monitoring Station 4 2/1/2008 2/2/2008 2/3/2008 2/4/2008 2/29/2008 Permissible Exposure Limit mg/m mg/m3 AMS 4

20 Lead (total) Air Monitoring Station 1 2/29/2008 Permissible Exposure Limit mg/m3 AMS mg/m3

21 Lead (total) Air Monitoring Station 2 Permissible Exposure Limit mg/m3 AMS mg/m3 2/1/2008 2/2/2008 2/3/2008 2/4/2008

22 Lead (total) Air Monitoring Station 3 Permissible Exposure Limit mg/m mg/m3 2/1/2008 2/2/2008 2/3/2008 2/4/2008 2/29/2008 AMS 3

23 Lead (total) Air Monitoring Station 4 2/1/2008 2/2/2008 2/3/2008 2/4/2008 2/29/2008 Permissible Exposure Limit mg/m mg/m3 AMS 4

24 Nickel (total) Air Monitoring Station 1 Permissible Exposure Limit mg/m mg/m3 AMS 1 2/29/2008

25 Nickel (total) Air Monitoring Station 2 Permissible Exposure Limit mg/m mg/m3 AMS 2 2/1/2008 2/2/2008 2/3/2008 2/4/2008

26 Nickel (total) Air Monitoring Station 3 2/1/2008 2/2/2008 2/3/2008 2/4/2008 2/29/2008 Permissible Exposure Limit mg/m mg/m3 AMS 3

27 Nickel (total) Air Monitoring Station 4 2/1/2008 2/2/2008 2/3/2008 2/4/2008 2/29/2008 AMS 4 Permissible Exposure Limit mg/m mg/m3

28 Total Dust Air Monitoring Station 1 2/29/2008 Permissible Exposure Limit mg/m3 AMS 1

29 Total Dust Air Monitoring Station 2 2/1/2008 2/2/2008 2/3/2008 2/4/2008 Permissible Exposure Limit mg/m3 AMS 2

30 Total Dust Air Monitoring Station 3 2/1/2008 2/2/2008 2/3/2008 2/4/2008 2/29/2008 Permissible Exposure Limit mg/m3 AMS 3

31 Total Dust Air Monitoring Station 4 2/1/2008 2/2/2008 2/3/2008 2/4/2008 2/29/2008 Permissible Exposure Limit mg/m3 AMS 4

32 Respirable Dust by Real-time Instrumentation Air Monitoring Station /29/2008 Permissible Exposure Limit mg/m3 Respirable Dust Daily Peak Values Respirable Dust Average Daily Values Print Date: 3/13/2008

33 Respirable Dust by Real-time Instrumentation Air Monitoring Station /1/2008 2/2/2008 2/3/2008 2/4/2008 Respirable Dust Daily Peak Values Respirable Dust Average Daily Values Permissible Exposure Limit mg/m3 Print Date: 3/13/2008

34 Respirable Dust by Real-time Instrumentation Air Monitoring Station /1/2008 2/2/2008 2/3/2008 2/4/2008 2/29/2008 Respirable Dust Daily Peak Values Respirable Dust Average Daily Values Permissible Exposure Limit mg/m3 Print Date: 3/13/2008

35 Respirable Dust by Real-time Instrumentation Air Monitoring Station /1/2008 2/2/2008 2/3/2008 2/4/2008 2/29/2008 Respirable Dust Daily Peak Values Respirable Dust Average Daily Values Permissible Exposure Limit mg/m3 Print Date: 3/14/2008